2nd Brexit Referendum, Italian style?

Streetdogs.blog the word on the street understands that for a referendum result in Italy to be valid, it must have a required 70% of the entitled electorate to actually partake in the voting in the said referendum, and a passing of the referendum itself also requires that 70% of those who voted in the referendum, voted in favour for the proposition contained in the referendum.

It might well serve our erstwhile neighbours across the Celtic Sea to adopt this convention in any potential forthcoming referendum on a 2nd Brexit Referendum, with perhaps this minor additional feature, given that an official title for our neighbour’s entity is The United Kingdom of Great Britain and Northern Island. Would it not be appropriate that each of its constituent Kingdoms and it’s Principality should be holding their own referendum on Brexit with these rules? Could anyone then reasonably complain about the outcome?